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प्रश्न
Give two uses of the following component present in air:
carbon dioxide
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उत्तर
Carbon dioxide: Carbon dioxide is used by plants to prepare their food by photosynthesis. Dry ice (solid carbon - dioxide) is used as a refrigerant. Carbon dioxide is used to prepare fizzy drinks like soda water.
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संबंधित प्रश्न
What was the ancient belief regarding the nature of matter ?
Write the chemical name of The white insoluble solid formed on the reaction of carbon dioxide with lime water.
Write ‘true’ or ‘false for the following;
Air is a compound.
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
What will happen if the number of vehicles and factories in your surroundings increases?
What will happen if the amount of water vapour in the air increases.
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. The constituent of air which is around 0.02% | A: Nitrogen |
| 2. The constituent of air which is inert or unreactive | B: Oxygen |
| 3. The constituent of air which is non-combustible, but supports combustion. |
C: Sulphur dioxide |
| 4. A pollutant in air responsible for acid rain | D: Carbon dioxide |
| 5. The main rare gas present in air. | E: Argon |
The composition of air is always exactly the same.
Cool and soothing wind: Breeze.
uproot trees wind: ______.
Match the items of Column I with the items of Column II
| Column I | Column II | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of air flow |
| (e) | Wind | (v) | Prevent dust particles |
